Comparing Reservoir Fluid Models to PVT Laboratory Measurements

Abstract

AbstractTo prove that PVT input to reservoir models is representative, the comparison between the modeling of PVT data and relevant PVT laboratory measurements should preferably be as direct as possible.A black oil reservoir simulation model can be described as a compositional model with only two hydrocarbon components (‘oil’ and ‘gas’). The reservoir fluid is represented by a set of tables, defining oil and gas viscosity and formation volume factor as a function of pressure, temperature and composition.Examples on quality assurance of fluid modeling by direct comparison of PVT input for black oil and compositional reservoir simulation with PVT laboratory measurements are shown in the present paper, including results from Differential Gas Liberation (DGL) for reservoir oil and Constant Volume Depletion (CVD) for reservoir gas.Challenges with regard to black-oil modeling of depth gradients are also discussed.